Dispatches had planned a in-depth look at the Boston Marathon Bombers this evening, but it seems as though they've managed to up the ante after last week's horrific murder in Woolwich. Matt Frei fronts this updated documentary, which asks what motivated these two sets of perpetrators to commit these horrific crimes, and asks if these latest incidents suggest that a whole new breed of terrorist is emerging on home turf. We're presuming that this won't be one for the worriers among us...